Disallow sorting on tensors

Author: bratseth

config-model/src/main/java/com/yahoo/schema/document/Attribute.java

@@ -109,7 +109,7 @@ public enum Type {
         private final String exportAttributeTypeName;
 
         Type(String name, String exportAttributeTypeName) {
-            this.myName=name;
+            this.myName = name;
             this.exportAttributeTypeName = exportAttributeTypeName;
         }
 

container-search/src/main/java/com/yahoo/prelude/searcher/ValidateSortingSearcher.java

@@ -124,6 +124,11 @@ private ErrorMessage validate(Query query) {
                             f.setSorter(new Sorting.LowerCaseSorter(name));
                         }
                     }
+                    else if (attrConfig.datatype() == AttributesConfig.Attribute.Datatype.TENSOR) {
+                        throw new IllegalArgumentException("Cannot sort on field '" + attrConfig.name() +
+                                                           "' because it is a tensor");
+                    }
+
                 }
                 if (f.getSorter() instanceof Sorting.UcaSorter sorter) {
                     String locale = sorter.getLocale();

container-search/src/test/java/com/yahoo/prelude/searcher/test/ValidateSortingSearcherTestCase.java

@@ -47,6 +47,17 @@ void testBasicValidation() {
         assertEquals("[ASCENDING:[rank]]", quoteAndTransform("+[relevance]"));
     }
 
+    @Test
+    void testDisallowSortingOnTensors() {
+        try {
+            quoteAndTransform("aTensor");
+            fail("Expected exception");
+        }
+        catch (IllegalArgumentException e) {
+            assertEquals("Cannot sort on field 'aTensor' because it is a tensor", e.getMessage());
+        }
+    }
+
     @Test
     void testInvalidSpec() {
         assertNull(quoteAndTransform("+a -e +c"));

container-search/src/test/java/com/yahoo/prelude/searcher/test/validate_sorting.cfg

@@ -1,4 +1,4 @@
-attribute[4]
+attribute[5]
 attribute[0].name                title
 attribute[0].datatype            STRING
 attribute[0].collectiontype      SINGLE
@@ -15,3 +15,6 @@ attribute[2].collectiontype      SINGLE
 attribute[3].name                c
 attribute[3].datatype            STRING
 attribute[3].collectiontype      SINGLE
+attribute[4].name                aTensor
+attribute[4].datatype            TENSOR
+attribute[4].collectiontype      SINGLE